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Three annotated panels side by side show K1 fragmenting over three consecutive days. Arrows show the orientation of object on sky. At top left of first panel, label on first line reads Fragmentation of Comet C/2025 K1 (ATLAS). Second line reads HST STIS MIRVIS. From left to right, panels are labeled November 8, 2025; November 9, 2025; and November 10, 2025. Each panel shows several bright, fuzzy, blue objects streaking diagonally from upper left to lower right of black background. In first panel, four comet-like objects are numbered 1 thru 4. In second panel, the largest object has broken into two pieces, 2a and 2b. In third panel, pieces appear to be moving away from each other diagonally. Arrows on last panel show orientation of image on sky. Arrow labeled N points to 8:30. Arrow labeled E points to 5:30. Relationship between north and east on the sky as seen from below is flipped relative to direction arrows on a map of the ground as seen from above.

Comet C/2025 K1 Compass Image

This annotated series of images from NASA’s Hubble Space Telescope of the fragmenting comet C/2025 K1 (ATLAS), or K1 for short, was taken over the course of three consecutive days: Nov. 8, 9, and 10, 2025. Arrows show the orientation of the image on the sky. 

Image Credit: Image: NASA, ESA, Dennis Bodewits (AU); Image Processing: Joseph DePasquale (STScI)
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Image CreditImage: NASA, ESA, Dennis Bodewits (AU); Image Processing: Joseph DePasquale (STScI)
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